Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1993-02-09
1994-06-14
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02P 602
Patent
active
053213424
ABSTRACT:
Control circuits for operating a two-phase brushless do motor from a dc power source are described. Control of the motor is optimized by detecting induced back EMF of the two phases to sense rotor phase position. It is common knowledge that the voltage developed across the terminals of a permanent magnet motor can be represented by a winding resistance, a winding inductance and a generated back EMF. In two-phase brushless dc and permanent magnet stepping motors, the induced back EMFs of the two phases are displaced from each other by 90 electrical degrees. Thus, by detecting the back EMFs of the two phases, an accurate relative position of rotor-to-stator can be determined at any rotor position. Commutation of the motor phases and closed loop control of the motor and load is achieved by accurately sensing the back EMFs of the two phases. Also, phase position of the permanent magnet rotor poles is detected by integrating the sensed back EMFs of the two phases to produce quadrature sinewaves the magnitudes of which are constant relative to rotor speed.
REFERENCES:
patent: 4232259 (1980-11-01), Kaieda et al.
patent: 4256983 (1981-03-01), Griffith et al.
patent: 4335339 (1982-06-01), Brickner
patent: 4859921 (1989-08-01), Archer
patent: 4914375 (1990-04-01), Hatanaka
Ro Bentsu
Weber Jr. G. Donald
LandOfFree
Two-phase brushless DC motor controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two-phase brushless DC motor controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-phase brushless DC motor controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1251829